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@Hugues-Mercusot
In order to use the curl you have to install the following:ca-certificates and ca-bundle
The error happened because ca-certificates is used to allow SSL-based applications to check for the autchencity of SSL connections and ca-bundle is the file that contains root and intermediate certificates.

@Hugues-Mercusot
The curl service gives you the errors (48 or 77) because of the different versions of curl and libcurl. (e.g curl 7.54.1 and libcurl 7.52.1). You may update the libcurl version by issuing the following command:

opkg install curl libcurl

I hope this will help. however, we cannot provide you with any further details on Z-wave.
Stay tuned.

They both rebooted in the middle of the night on Saturday at the exact same time. Which leads me to believe that the office or my USB hub might have momentarily lost power.

In any case, I haven't been able to reproduce your issue.

I do, however, have a suggestion!

Try configuring the cron daemon to run the power-dock command once every 10 or 20 minutes.

Install the power-dock package:

opkg update
opkg install power-dock

Open the crontab editor

crontab -e

Enter:

#
*/20 * * * * /usr/bin/power-dock
#

Save and exit, then restart the cron daemon:

/etc/init.d/cron restart

My suspicion here is that the Battery Management chip is not detecting enough current draw from the Omega and deciding that it should just shut down to conserve power. By running the power-dock command every once in a while, you give the chip an indication that it needs to stay powered on!

Are you using the Onion Arduino Library, and if so, have you downloaded and installed it?
Note that for Arduino Dock 2, there's no need to use the Onion Library or the Onion object. Try getting rid of that and trying again.